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diff --git a/examples/helpsystem/whatsthis.h b/examples/helpsystem/whatsthis.h
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+++ b/examples/helpsystem/whatsthis.h
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+/****************************************************************************
+**
+** Copyright (C) 1992-2008 Trolltech ASA.  All rights reserved.
+**
+** This file is part of an example program for Qt.  This example
+** program may be used, distributed and modified without limitation.
+**
+*****************************************************************************/
+
+#ifndef WHATSTHIS_H
+#define WHATSTHIS_H
+
+#include <qwhatsthis.h> 
+
+class QHeader;
+class QTable;
+
+class WhatsThis : public QObject, public QWhatsThis
+{
+    Q_OBJECT
+public:
+    WhatsThis( QWidget *w, QWidget *watch = 0 );
+
+    bool clicked( const QString &link );
+    QWidget *parentWidget() const;
+
+signals:
+    void linkClicked( const QString &link );
+
+private:
+    QWidget *widget;
+};
+
+class HeaderWhatsThis : public WhatsThis
+{
+public: 
+    HeaderWhatsThis( QHeader *h );
+
+    QString text( const QPoint &p );
+};
+
+class TableWhatsThis : public WhatsThis
+{
+public: 
+    TableWhatsThis( QTable *t );
+
+    QString text( const QPoint &p );
+};
+
+#endif